4.7 Article

Effective Li3AlF6 Surface Coating for High-Voltage Lithium-Ion Battery Operation

期刊

ACS APPLIED ENERGY MATERIALS
卷 4, 期 9, 页码 9866-9870

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c01885

关键词

lithium-ion battery; high-voltage cathode material; surface coating; ternary lithium fluoride; Li3AlF6

资金

  1. JSPS KAKENHI [19K15668]
  2. JST ALCA-SPRING, Japan [JPMJAL1301]
  3. Grants-in-Aid for Scientific Research [19K15668] Funding Source: KAKEN

向作者/读者索取更多资源

The study demonstrates the potential of beta-Li3AlF6 as a high-voltage cathode coating agent by improving the cathode performance through surface coating on LiNi0.5Mn1.5O4 and LiCoO2 electrodes. The coated cathodes show superior cycle performance with high capacity retention, showcasing the stability and conductivity of beta-Li3AlF6 as a coating material.
Enhancing the energy density of high-voltage lithium-ion battery cathodes is challenging. Cathode surface coating can effectively suppress the irreversible side reactions occurring at the cathode/electrolyte interface. Recent high-throughput theoretical studies have demonstrated the potential of a ternary lithium fluoride, beta-Li3AlF6, as a coating agent owing to its high anodic limit, sufficient stability against various cathode materials, and sufficient Li+-ion conductivity. This study improves the cathode performance by the surface coating of beta-Li3AlF6 on LiNi0.5Mn1.5O4 and LiCoO2 cathodes using a simple sol-gel calcination process. beta-Li3AlF6-coated LiNi0.5Mn1.5O4 shows superior cycle performance, with a capacity retention of 98.2% and a coulombic efficiency of 99% at the 100th cycle. Further, beta-Li3AlF6-coated LiCoO2 can be cycled at a high voltage of 4.5 V with a capacity retention of 95% at the 100th cycle. These results demonstrate the potential of beta-Li3AlF6 as a high-voltage cathode coating agent.

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